I found a dead roof rat in our chicken's coop last winter - but I wasn't sure how it died. Her coop mate died last winter, so I think she thinks anything that moves is part of her flock. Last Thursday - the chicken - which now free ranges in a backyard - was tossing a dead grey bird (Junco?) up in the air. At first I though it was a mouse. I didn't see either of the murders. Is this typical hen behavior? Maybe she picked up some bad habits from the neighbor cats, which often come by to visit and hang out. I saw her intimidate a dog off his bone once (To be sure the dog had been trained to fear chickens.) This is a 14month old Buff - a good layer 5 to 6 eggs a week.